haiku/headers/os/interface/LayoutItem.h

/*
 * Copyright 2006, Haiku, Inc. All rights reserved.
 * Distributed under the terms of the MIT License.
 */
#ifndef	_LAYOUT_ITEM_H
#define	_LAYOUT_ITEM_H

#include <Alignment.h>
#include <Rect.h>
#include <Size.h>

class BLayout;
class BView;

class BLayoutItem {
public:
								BLayoutItem();
	virtual						~BLayoutItem();

			BLayout*			Layout() const;

	virtual	BSize				MinSize() = 0;
	virtual	BSize				MaxSize() = 0;
	virtual	BSize				PreferredSize() = 0;
	virtual	BAlignment			Alignment() = 0;

	virtual	void				SetExplicitMinSize(BSize size) = 0;
	virtual	void				SetExplicitMaxSize(BSize size) = 0;
	virtual	void				SetExplicitPreferredSize(BSize size) = 0;
	virtual	void				SetExplicitAlignment(BAlignment alignment) = 0;

	virtual	bool				IsVisible() = 0;
	virtual	void				SetVisible(bool visible) = 0;

	virtual	BRect				Frame() = 0;
	virtual	void				SetFrame(BRect frame) = 0;

	virtual	bool				HasHeightForWidth();
	virtual	void				GetHeightForWidth(float width, float* min,
									float* max, float* preferred);

	virtual	BView*				View();

	virtual	void				InvalidateLayout();

			void*				LayoutData() const;
			void				SetLayoutData(void* data);

			void				AlignInFrame(BRect frame);
	
private:
			friend class BLayout;

			void				SetLayout(BLayout* layout);

			BLayout*			fLayout;
			void*				fLayoutData;
};

#endif	// _LAYOUT_ITEM_H